Stabilization of diborane-alkyne reaction product with triethylamine



3x5 52; 00 00 0mm 00m 0mm 000 Omn 00 0mm 00m 0mm 00m 00m On; 00 On 0 ZASLOWSKY Filed May 21, 1956 STABILIZATION OF DIBORANE-ALKYNE REACTION PRODUCT WITH TRIETHYLAMINE March 28, 1961 (ww) EIHHSSEIHd INVENTOR. 9064 ,d- 2 B Y W) \%1wzzwLs 77 2&m

ATTORNEYS Unit-(165mg 9 STABILIZATION F DIBOR ANE-ALKYNE REAC- TION PRODUCT WITH TRIETHYLAMINE Joel A. Zaslowsky, Niagara Falls, N.Y., assignor, by

mesne assignments, to Olin Mathieson Chemical Corporation, a corporation of Virginia Filed May 21, 1956, Ser. No. 586,313

2 Claims. (Cl. 52-.5)

This invention relates to the stabilization of liquid borohydrocarbons produced by reacting diborane and acetylene or methylacetylene.

The production of liquid borohydrocarbons has been previously proposed by the reaction of diborane and unviscosity, slight tendency to be pyrophoric, lowtoxicity,

low freezing point and good storage stability. Although 2,977,207 Patented Mar. 28, 1961 perature, the reaction is initiated and proceeds smoothly. The reaction product is condensed in a series'of traps cooled to 78 C. The pertinent data with respect to two runs are set out in Table I below.

Table I REAGTION'OF DTBORANE WITH METHYL-ACETYLENE Operating Time, Min 286 Observed Operating Temperature, C 125-166 130-158 Ratio. HgIBzHoZCQH 10:3:1 10:3:1 Flow Rate, BZHfi, cc./min 661 566 Flow Rate, 03114, cc./min 215 217 Flow Rate, H2, cc./min 2, 275 2, 275 Materials In Moles:

BQHQ 11. 59 7. 23 CHQO'; OIL-.. 3.78 2.78 2 39. 60 29. 10 Materials Out:

Product, grams 165 98 Percent B (Av. values) 1 30.8 29. 2

The liquid products of these two runs are combined.

Part 2.A portion of the combined liquid products of Part 1 are then stabilized by the addition'thereto of 1 percent bylweight of triethylamine.

The absolute pressure exerted bythe untreated and triethylamine containing products is measured with a bubble-off manometer. Approximately five milliliters of material is sealed in a tube, equipped with abreak seal, which is sealed to the manometer. With the sample frozen .in a liquid nitrogen bath, the entire system is the liquid borohydrocarbons produced by the reaction of diborane and unsaturated hydrocarbons described above have satisfactory storage stability, it has now been found that certain of these liquid borohydrocarhons, particularly those produced by the reaction of diborane and acetylene or methyl acetylene can be further stabilized with respect to vapor pressure without undue change in other 'properties by incorporation into the borohydrocarbons of particularly small amounts of triethylamine.

Thus according to the method of this inventionliquid reaction products of-diborane and acetylene or methylacetylene arestabilized with respect 'to vapor pressure by incorporation into such reaction. products of 0.05 to 2.0 per cent by weight of triethylamine.

The invention will ing example:

EXAMPLE 1 Part 1.A mixture of hydrogen and diborane is re-' acted witha mixture of hydrogen and methylacetylene. The apparatus employed comprises a heating coil sur: rounding a dispersion tube longitudinally situated in the center of an elongated jacketed reaction chamber. The

about i be furtherillustrated by the follow:

evacuated and then isolated by closing the stopcock. The sample then is allowed to warm to room tempera-. ture. Pressure readings are taken daily for .the first week and thereafter weekly, for theduration of the test. All pressure readings of thesealed sample are corrected 'for changes in barometric pressure.

The time-pressure relationship of the triethylamine' containing reaction product together with that of the control sample is presented in the accompanying figure.

This figure indicates. that the incorporationv of triethylamine into the methyl acetylene-diborane.reaction product improves the stability of the product.

. Although the process of 'this invention has been de- 'scribed with respect to the particular diborane-methylacetylene reaction products, of Example L- the process of this invention is applicable to such reactionproducts produced according to less limited ranges of' reaction conditions. For example, the temperatures employed may rangefrom about 100 C. to 250 C.v T-herelative amounts ofdiborane and acetylene hydrocarbons used can be varied widely, themolar ratio of diborane to acetylene hydrocarbon being Within the range from I 0.5;1'to 1051. The amounts of diluent gas such as.

hydrogen, nitrogen, argon, or mixtures thereof,can also be varied widely, the amount so introduced in practice.

heating coil and jacket are connected in series and mineral.

oil at 140 C is circulated through the system. The dispersion tube contains a number of small holes of about 1' mm. diameter. A thermocouple inserted into aglass tube situated at the lower end ofthe dispersion tube measures the reaction temperature. The mixture of persion tube, and when the reactor is at the proper tem- 5' a being dependent upon the amount of diluent required to "effect essential mixing and heat transfer necessary, for any- In general, the gases en J'teri ng the reaction system (diborane, acetylene hydrocar bon and diluent gas) will be composed of fromabout 20 to percent by volumeof diluent gas. Instead ofthe; indirect heat exchange system described in Example If for initiatingand maintaining the'appropriate reactionj particular 'mode of operation.

temperature, a direct heat exchange system may be em- 'ployed such as, for example, amass of mercury whichthe reactant gases are passed.

I claim:

l. A method forthe stabilization with respectto vapor pressure of liquid reaction products of diborane and a material selected from the class consisting of acetylene and methyl acetylene which comprises incorporating into the liquid reaction products about 0.05 to 2.0 weight percent of tn'ethylamine.

2. A method for the stabilization with respect to vapor pressure of liquid reaction products of diborane and methyl acetylene which comprises incorporating into the liquid reaction products about 0.05 to 2.0 weight percent of triethylamine.

No references cited. 

1. A METHOD FOR THE STABILIZATION WITH RESPECT TO VAPOR PRESSURE OF LIQUID REACTION PRODUCTS OF DIBORANE AND A MATERIAL SELECTED FROM THE CLASS CONSISTING OF ACETYLENE AND METHYL ACETYLENE WHICH COMPRISES INCORPORATING INTO THE LIQUID REACTION PRODUCTS ABOUT 0.05 TO 2.0 WEIGHT PERCENT OF TRIETHYLAMINE. 